TSSA - The Simplest Symmetrical Amplifier

[sonnya]

Or even more fun. What if it could be a single cfb opamp dropin??

[Lazy Cat]

Originally Posted by sonnya

I am thinking of doing a 2 stage tssa preamp.

What should max gain be ? 6 or 12 dB??!

Make both, jumper selectable.

Originally Posted by sonnya

Or even more fun. What if it could be a single cfb opamp dropin??

What? You'll compete with Bursons?

[sonnya]

Originally Posted by Lazy Cat

Make both, jumper selectable.


What? You'll compete with Bursons?

I do not think Bursons sell them any more!?

By the way, i have made one before and it works very well besides of the offset in the PMBFJ620 which i did not see come....

Jfet folded cascode with diamond buffer opamp

With a little luck i can make a 2 stage CFB in the same space.

[Lazy Cat]

Originally Posted by sonnya

I do not think Bursons sell them any more!?

By the way, i have made one before and it works very well besides of the offset in the PMBFJ620 which i did not see come....

Jfet folded cascode with diamond buffer opamp

With a little luck i can make a 2 stage CFB in the same space.

WOW I didn't know what you did already. Amazing.

I would be the first to order few of these CFB OP amps.

[Salas]

Sonny is our miniaturization wiz. Indispensable skills in new age electronics. We will end up with stereoscopes sooner or later to make a simple mod with the rate parts are shrinking.

[sonnya]

Some quick calculations tell me that it will not be as compact as the "discrete opamp" i already have made.

I need to use SOT-223 package for the output devices.

[sonnya]

It suffers the same problem as TSSA V1.6 -> high zout of ~60Ohm.

but 2Vpp input, 6dB gain and Load of 1K will give you 3,67Vpp out with THD of 0.000323% thd..

I do not think it is bad. See attachment...

[Esperado]

Originally Posted by sonnya

It suffers the same problem as TSSA V1.6 -> high zout of ~60Ohm.
but 2Vpp input, 6dB gain and Load of 1K will give you 3,67Vpp out with THD of 0.000323% thd..
I do not think it is bad. See attachment...

So, it looks OK for a 10K load, witch respond at most frequent requirement in a preamp ?
And, as output stage in a preamp has to be an overkiller low Z headphone amp, for it can drive any capacitive load, easy to add a single buffer with discreet transistors, don't you think ?
What about the PSRR ? (I love the Nightly maintenance pictures :-)

[sonnya]

Originally Posted by Esperado

So, it looks OK for a 10K load, witch respond at most frequent requirement in a preamp ?
And, as output stage in a preamp has to be an overkiller low Z headphone amp, for it can drive any capacitive load, easy to add a single buffer with discreet transistors, don't you think ?
What about the PSRR ? (I love the Nightly maintenance pictures :-)

I think the PSRR is okay.

Distortion into 10K is a little higher but better roll off.

[Jay]

Suitable for headphone amp.